The current market price for a widget is $150 and quantity demanded at that price is 80 for textbooks. If price decreases to $90, and quantity demanded increased to 180.  How much is the price elasticity of demand? At this price change is it the elastic, inelastic or unit elastic, and why? Given the information on the price elasticity of demand of textbook, what happens to total revenue for this market for the decrease in price and wh

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